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The i18n custom bindings create v8 values from results for language
detection, but do so in an inefficient way (constructing a base::Value
and then converting to v8::Value). Update this to use
gin::DataObjectBuilder to construct the v8 value directly, and, while
we're at it, use some C++11 awesomeness in movable types.

Bug: None
Change-Id: I80597627b0b3803e50ecbe34009682161d178c7d
Reviewed-on: https://chromium-review.googlesource.com/892202Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532968}